code: def test_insertion_and_find_even_degree(self):
      btree = BTree(4)
      for i in self.keys_to_insert:
          btree.insert_key(i)
  
      for i in range(100):
          key = self.random.choice(self.keys_to_insert)
          self.assertTrue(btree.find(key))
  
imports: from algorithms.tree.traversal import preorder, preorder_rec, postorder, postorder_rec, inorder, inorder_rec
  from algorithms.tree.b_tree import BTree
  from algorithms.tree import construct_tree_postorder_preorder
  from algorithms.tree.fenwick_tree.fenwick_tree import Fenwick_Tree
  import unittest
label_desc: Use image node_id 3 for calling the TestBTree obj's underlying member method code with example usage: obj.test_insertion_and_find_even_degree() without return types